import sys

from PySide import QtGui, QtCore

app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow(parent=None, flags=QtCore.Qt.FramelessWindowHint)

MainFrame = QtGui.QFrame(MainWindow)
MainWindow.setCentralWidget(MainFrame)
MainFrameLayout = QtGui.QVBoxLayout(MainFrame)

label = QtGui.QLabel("A Label")
MainFrameLayout.addWidget(label)

MainWindow.show()
sys.exit(app.exec_())
